BERLIN (Reuters) -German Economy Minister Robert Habeck on Sunday cancelled a planned trip to the Middle East to focus on talks over a hole in Germany's 2024 budget and said he was "very optimistic" a solution would be found. The economy minister was due to fly to Dubai on Monday evening to attend COP28 and then to Oman, Israel and Saudi Arabia but was asked by the chancellor to postpone the trip, a spokesperson said. The coalition government is in intensive talks over how to tackle a 17-billion